Volume and pressure-controlled



April 7, 1936. s. D. ROSS I VOLUME AND PRESSURE} CONTROLLED ROTARY PUMP Filed May 16, 1954 Stank D. R

' Patented Apr. 7, I936 PATENT: OFFl CE VOLUME m rnnssunn-coirrnonnnn noranr PUMP Stanley D'. Ross, Vancouver, British Columbia,

. Canada Application May 16, 1934, Serial Nb. 728,007

2 Claims. (01. ma -12o) This invention relates to improvements in rotary pumps and compressors and the improvements are directed to providing positive and force feed lubrication to the bearings thereof, and to means for controlling and adjusting the pressure and volume of the pump when in operation.

A particular object of my invention is to provide a pump or compressor suitable for use in carrying out my process of carburetion as set out in a co-pending application recently filed.

A further object ofmy invention is to provide a pump or compressor having improved lubricating means for the main bearings as being attached directly to an electric motor. Such devices usually run at high speed and require positive.

lubricating means at these points to prevent running hot. v

A still further object of my invention is to prowhereby the discharge oi'the pump or compressor maybe regulated as to pressure.

, Still another object of my invention is to'provide volume regulating means whereby the output of the pump or compressor is subject to adjustment. s

Another object of my invention is to provide means whereby the suction or vacuum of the pump or compressor may be regulated to meet varying conditions.

With these and other objects in view I have invented the improvements that are the subject of this application'mnd which are further illustrated in the accompanying drawing forming part of this application, in which: I

Figure 1 is a side elevation of a rotary com pressor showing discharge and suction connections and an adjusting screw in the 'end cover. Figure 2 is a sectional elevation taken on line 2-2 of Figure land shows a balanced rotor in position with movable vane extended out of its housing by the compression spring. The opening of the suction port is.shown in right-hand corner, and the opening for the regulating screw in left-hand corner.

'Figure 3 is a sectional view taken on the line 3-3 of Figure 2 and shows how the regulating screw closw the end of the discharge duct which is indicated in dotted lines IIIFIBIIIQ 2.

I Figure 4 is an outside plan view of the end cover plate fitting the suction side of the compressor and shows the suction port therethrough and the regulatingscrew. aperture.

Figure 5 is an end elevation of cover plate shown in Figure 4. as Figure 61s a detail and sectional view of part of vide simple and positive pressure adjusting means cover plate taken on line 6-4 of Figure 5 to show the position of the transfer duct formed in the cover plate to form a bye-pass from the discharge side to suction side of compressor.

Figure 7 is another detail and sectional view of 5 a part of the cover plate taken on line 1-1 of Figure 4 and shows the recess formed on inner side of cover plate at the end of, the regulating screw aperture and shows the end of transfer duct breaking into the side of the recess. 10

Figure 8 is another detail and se tional view of a. part of the cover plate taken on t e line 8-8 of Figure 4 and shows how the transfer duct or byepass is formed in the cover plate by drilling from the edge of the recess shown in Figure 7- and con- 16 necting with a hole drilled through from/the edge of the suction port on the inner side of cover.

' Figure 9 is a sectional elevation of the cover plate taken on line 9-9 of Figure 4 and diagrammatically illustrates the position of the lubricat- 20 ing ports drilled into cover to serve the main end bearing.

In the drawing like numerals of reference indicate like parts in all the figures, and the numeral l indicates a rotary compressor body having the 26 feet 2 for support and a pair of end cover plates 3 and 4, the plate 3 covering the discharge side of the compressor and the plate 4 the suction side.

Bosses 5 are cast on each cover plate and comprise the main bearings to the compressor. 30

A concentric aperture 6 is formed right through the main body I which is closed by the cover plates 3 and 4 when the compressor is assembled. An eccentric and balanced rotor I is mounted in the aperture 8 carried in the main bearings I by the 35 shaft 8 of the rotor. One end of the shaft I projects through the end cover plate 4 to provide a connection or drive, while the other end of the shaft is a stub bearing housed in the boss I on the cover plate 3.

registering with the port apertures in the end covers 3 and 4' when assembled.

At the extreme inner end of the horizontal portion of the discharge port I3 is an extension port is drilled right through the I and the as outer end registers with the needle valve aperture it formed in the end cover 4. I i a In the end cover 4 is mounted the needle valve li registering with and controlling the opening of the port IS. A lock nut I8 is provided for securing the setting of the needle valve ll. Upon the inner face of the cover 4 is formed a recess 9 at the end of the needle valve aperture I6 and drilled in from the edge of the recess is the bye-pass passage? 20 -(see'Figure 8) communicating with the suction port opening i4 in the cover plate 4. i

The bye-pass 20 has the important function of controlling the volume and pressure discharge of the compressor and pump and also the suction bymanipulation of the needle valve llsopening, closing and adjusting the extension port l5, as for instance, by opening the I through the backing on of the needle valve I l, the pressure set up on the discharge side of the compressor is lowered by reason of 'the'opening of the byepass which perniits the escape of the fluid in the compressor to the suction side, thereby lowering both the volume and pressure being discharged through the discharge port i3.

Opening of the port l5 also lowers the suction of the compressor and pump through permitting of internal circulation within the compressor from the discharge to the suction side which effects the external suction by lowering the vacuum within the compressor.

In the boss bearings 5 are provided forced lubricating means comprising drilled ducts 22 and 23 communicating with the ends of the bearings 5; A concentric recess 24 is formed adjacent the outer end of the bearing communicating with the duct 23, the opposite end of which is in open communication with the suction side of the compressor or pump, while the other duct 22 is in open communication with the pressure or discharge side and leads to another concentric recess 24a spaced from and similar to the recess 26. This arrangement permits of a circulation being set up in the duct 22 to the inner end ofthe bearing 5 whence the oil travels to the outer end towards the recess 24 where it is stopped' from further progress through the suction set up the same from side to side constituting a cylindri-cal working chamber, a pair of end cover plates secured to the sides or said body as closures for said passage, said cover plates having shaitbear loss, a shaft located in said bearings and passing I through said 'working chamber, a rotor eccentrically mounted on saidshait within said working chamber, a relatively stationarily located reciprocating vane carried by said body and in cooperation with said rotor dividing said working cover plates to cooperate with said reduced end,-

said' last named cover plate having a bye-pass ductir'om said needle valved endpf said'dispressor body having a transverse passage through the same from side to side constituting a cylindrical working chamber, a pair of end cover plates secured to the sides of said body as closures for said passage, said cover plates having shaft hearings, a shaft located in said bearings and passing through said working chamber, a rotor eccentrically mounted on said shaft within said working chamber, a relatively stationarily located reciprocating vane carried by said body and in cooperation with said rotor dividing said working chamber into a suction side and a discharge side, said body having a suction port and a discharge port, each of said ports including. a portion paralleling the axis of the body with which portions the covers have communicating openings for connection of fluid intake and outlet pipe lines respectively, each of said suction and discharge ports also including radial portions communicating with said working chamber, the discharge port extending entirely through said body and terminating opposite the outlet end thereof in a reduced end, a needle valve carriedby one or said cover plates to cooperate with said reduced end, said last named cover plate having a bye-pass duct from said needle valved end of said discharge port to said suction port for purposes described, each of said cover plates having a pair of spaced apart annularv lubricating grooves in their shaft bearing portions and a duct from one of said grooves to the suction side oi saidworking chamber and a duct from the other of said grooves to the discharge side of said working chamber. v

STANLEY D. ROSS." 

